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I have a '94 base (3100) that trips a Check Engine light when deccelerating from highway speed. For example, when slowing down from approx. 70 mph, light comes on around 55-60 mph and stays on until I shut the car off. I was told that this has to do with a bad O2 sensor that was replaced.

Some time back, I disconnected the battery for about 10 minutes to try and clear the computer. This was good for a little while but, the problem returned. I tried the same thing yesterday, and no problems yet.

Anyways, if the sensor had been replaced would it still trip the computer? I tried to read the code using the paperclip trick, but didn't understand where the holes were. Can anyone tell me where I can get the codes read, and possibly cleared? I was told that I would have to go to a GM dealer, and they would charge a fortune (for the "work" that need to be done).

This might not seem like a big deal, but it basically voids the credibility of that Check Engine light.

I have a '94 base (3100) that trips a Check Engine light when deccelerating from highway speed. For example, when slowing down from approx. 70 mph, light comes on around 55-60 mph and stays on until I shut the car off. I was told that this has to do with a bad O2 sensor that was replaced.

Some time back, I disconnected the battery for about 10 minutes to try and clear the computer. This was good for a little while but, the problem returned. I tried the same thing yesterday, and no problems yet.

Anyways, if the sensor had been replaced would it still trip the computer? I tried to read the code using the paperclip trick, but didn't understand where the holes were. Can anyone tell me where I can get the codes read, and possibly cleared? I was told that I would have to go to a GM dealer, and they would charge a fortune (for the "work" that need to be done).

Most likely the EGR valve needs to be cleaned or replaced. ÃƒÆ’Ã†â€™Ãƒâ€ Ã¢â‚¬â„¢ÃƒÆ’Ã¢â‚¬Â ÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢ÃƒÆ’Ã†â€™Ãƒâ€šÃ‚Â¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡Ãƒâ€šÃ‚Â¬ÃƒÆ’Ã¢â‚¬Â¦Ãƒâ€šÃ‚Â¡ÃƒÆ’Ã†â€™Ãƒâ€ Ã¢â‚¬â„¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â‚¬Å¡Ã‚Â¬Ãƒâ€¦Ã‚Â¡ÃƒÆ’Ã†â€™ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡ Hydro carbon deposits build up and clog the valve itself, setting off the SES light. ÃƒÆ’Ã†â€™Ãƒâ€ Ã¢â‚¬â„¢ÃƒÆ’Ã¢â‚¬Â ÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢ÃƒÆ’Ã†â€™Ãƒâ€šÃ‚Â¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡Ãƒâ€šÃ‚Â¬ÃƒÆ’Ã¢â‚¬Â¦Ãƒâ€šÃ‚Â¡ÃƒÆ’Ã†â€™Ãƒâ€ Ã¢â‚¬â„¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â‚¬Å¡Ã‚Â¬Ãƒâ€¦Ã‚Â¡ÃƒÆ’Ã†â€™ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡ As far as the paper clip not working...I have enclosed a link below that explains why the terminals could not be found.

I too have exactly the same problem.Can anyone throw some light as to 1)where the EGR valve is. :rock: (steps on how to remove it will be appreciated)2)can this problem be left alone, without causing any harm to my engine (94 base beretta 3.1)

I too have exactly the same problem.Can anyone throw some light as to 1)where the EGR valve is. :rock: ÃƒÆ’Ã†â€™Ãƒâ€ Ã¢â‚¬â„¢ÃƒÆ’Ã¢â‚¬Â ÃƒÂ¢Ã¢â€šÂ¬Ã¢â€žÂ¢ÃƒÆ’Ã†â€™Ãƒâ€šÃ‚Â¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡Ãƒâ€šÃ‚Â¬ÃƒÆ’Ã¢â‚¬Â¦Ãƒâ€šÃ‚Â¡ÃƒÆ’Ã†â€™Ãƒâ€ Ã¢â‚¬â„¢ÃƒÆ’Ã‚Â¢ÃƒÂ¢Ã¢â‚¬Å¡Ã‚Â¬Ãƒâ€¦Ã‚Â¡ÃƒÆ’Ã†â€™ÃƒÂ¢Ã¢â€šÂ¬Ã…Â¡ (steps on how to remove it will be appreciated)2)can this problem be left alone, without causing any harm to my engine (94 base beretta 3.1)

On a 3100 it is located on the intake, to the right of the 3100 lettering and behind the throttle body. Two or three bolts are all that hold them on.

It's not likely to cause any major problems but it certainly isn't good for the engine to be driven with the SES lamp on.

well the egr may well be a problem.. i cleaned mine and replaced my o2 sensor and mine was still comin on "coasting" from a higher speed.fix?12.75 at advancechiltons and haynes calll it the intake air temp sensorask for a air charge sensor.food for thought

I would appreciate answers to the following questions1) did I clean the EGR or something else ? 2) what/where is the intake plenum? 3) how do you get the electrical connector off? I tried, failed, then left it connected and removed the EGR top half.4) Is the "service engine soon" light the same as the "check engine" light ? I get the former.

This did not help my Idle one bit, my car still stalled at a traffic light , and the check engine light still comes on as usual.

[EDIT] Another possible symptom is that I smell gas after startup. (while I wait for the engine to warm up)